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<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    .top {
      background: url('../images/sprite.png') no-repeat -265px -46px;
      width: 48px;
      height: 44px;
      position: fixed;
      right: 40px;
      bottom: 40px;
    }

    .top:hover{
      background-position: -325px -46px;
    }
  </style>
</head>

<body>
  <div class="top">
  </div>
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</body>

</html>